Ellsworth caee



(No Model.)

E.` CARR.

BALL GASTER.

No. 348,887. Patented Sept. 7, 1886.

ITG. 2.

hventor E/ Lswon THL'IUW?,A

I Zorneg WLtnesSes:

tUNrTED STATES PATENT OFFICE.

ELLSYVORTH CARR, OF TROY, NEV YORK, ASSIGNOR OF ONE-HALF TO JOHN H. REYNOLDS, OF SAME PLAGE.

BALL CASTER.

LECIFCATION forming part ofl Letters Patent No. 348,887, dated September 7, 1886.

A pplieniien filed June 1U, 1586. Serial No. 204,652.

To all whom 'it may concern:

Be it known that l`, EixLswoRTH CARR., ot" Troy, in the county et' Rensselaer' and State of New York, have invented ncwand useful Ini- 5 provemeut's in Ball Casters, of which the l'ollowing is a specilication.

My invention relates to improvements in ball casters; and it consists of the novel construction and arrangement of parts herein described and claimed.

ln the accompanying drawings, which are herein ret'erred to, and l'orin part of this specilieation, Figure 1 is a vertical section ol' my caster through its center line with the ball shown in elevation; Fig. 2, a detached plan view of' the retainingpiecc; Fig. 3. al1 inverted plan view ol' the bearingvpiece; Fig. 4, an inverted plan view of my easter on a reduced scale. Figs. Sand G aremodileations'ofFigs. 2 and 3 on a reduced scale.

As represented in the drawings, A is the rolling ballot' my easter, which should be made in the forni of a true sphere, of metal or other substance having sut'ticient endurance to stand the wear.

:l is the bearing-piece, made in polygonal forni, and having in its lower l'ace a polygonal pyramidal depression, I), which sit-s upon the rolling ball A in such a manner that the latter will bear at points on the sides of the depressions b, thesaid sides forming taugents to the spherical surface of said ball.

C is the retaining-plate, provided with a tiange, c, by which the Acaster is secured to its required place. A recess, c', is formed in the upper side of said retaining-piece for the purpose of receiving the bearing-piece B. The diameter of said recess should be sufficient to permit said bearing-piece to enter therein with 4.o perfect freedom, and the depth et' said recess should allow thel upper face of the bearingpiece B to lie `tiush or nearly iush with the .produce an equally goed result.

upper face of said retaiuingpiece. In the (No model.)

lower face of said rctainingpieee apolygoual opening, c2, is formed diagonally to the recess c', and said opening ilares upwardly into the recess c. The diameter ot' the opening ci must be suflicient to permita segment ofthe ball A to protrude below the bottom ot' the retainingpiece C; but the llaring sides of said opening` will prevent said ball from dropping out when the article to which the caster is attached is raised up.

\Vhen my caster is applied for use, the several parts are arranged as shown in Fig. 1, with the upper faces of the bcaring'piece C bearing against the under sideof the article to which the easter is attached, and with the ball A held in the depression b by the walls of the opening c, the lower part of said ball protrud- 63 ing below the under face ol` the retaining-piece C, so that the weight will rest on the ball A, which can be rotated in any direction when Aso fitted, thereby permitting the article to be moved on its casters in any required direction. 65

Then preferred, the depression b and opening c2 may have the forni of a triangle, as shown in Figs. 5 and 6; or they may be made in any other preferred polygonal forni and I claim as my invention- The combination, with the ball A and bearing-piece Rhaving apolygonal pyramidal depression, b, for receiving said ball, of the retaining-plate O, provided with a recess, c', 7 5 for holding the bearing-piece B, and having a polygonal opening, c2, which ilares upwardly into the recess c' in such manner that the ball A, while bei ng perfectly free to rotate in said opening, will be retained in place thereby, as 8o herein specified.

ELLSVORTH CARR.

Vi tnesses:

XVM. H. Low, S. B. BREWER. 

